Abstract An isomorphism between two hermitian unitals is provided, and used to treat isomorphisms of classical groups that are related to the isomorphism between certain simple real Lie algebras of types A and D (and rank 3).

Markus J. Stroppel

Advances in Geometry

ADVANCES IN GEOMETRY 是一本数学期刊，用于发表几何领域中质量卓越的原创研究文章。几何学是一个具有悠久传统和显着重要性的领域。空间和空间模式的研究是一项主要的数学活动；几何思想和几何语言渗透到所有的数学中。

Advances in Geometry is a mathematics journal dedicated to publishing high-quality original research articles in the field of geometry. Geometry, with its long-standing tradition and significant importance, involves the study of space and spatial patterns, which is a major mathematical activity. Geometric ideas and language permeate all areas of mathematics.

《Advances in Geometry》是一本专注于几何领域的数学期刊，致力于发表高质量的原创研究文章。几何学作为一个历史悠久且极具重要性的学科，涉及空间及其模式的研究，这是一项主要的数学活动。几何思想和语言在所有数学领域中都有着深刻的影响。

Category	Quartile
数学	4
数学, 数学	4

An isomorphism between unitals and between related classical groups

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